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Dental Hygiene Board Review > Radiology > Flashcards

Radiology Flashcards

1
Q

the ejection of an electron from na atom, produces charged ion pairs or free radicals

A

ionization

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2
Q

the ______ the group’s wavelength, the stronger the energy, x-rays produce ionization, others do not

A

shorter

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3
Q

60 impulses of x-rays = ?

A

1 second

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4
Q

descrive the number or electron flowing

A

Amps (mA)

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5
Q

describes the potential differences between the - and + and the speed or force of the moving electrons toward the + charge

A

Volts (kVp)

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6
Q

want short or long wavelength?

A

short- better quality

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7
Q

filters out weak x ray photons

A

aluminium filtration

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8
Q

what affects penetration quality?

A

kVp and filtration

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9
Q

what affects quantity?

A

mA, exposure time, kVp, aluminum filtration, distance

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10
Q

more photons = more ?

A

density (energy=blackness)

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11
Q

how to get more photons

A

lower filtration/distance, also affected by mA, kVp, exposure time

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12
Q

a short scale contrast is from ?

A

less kVp and aluminum

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13
Q

what affects contrast?

A

kVp and filtration only

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14
Q

area of unsharpness

A

penumbra

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15
Q

SLOB rule

A

same ling, opposite buccal

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16
Q

if the distance is doubled or halved, the original energy changes by factor of ___?

A

4

17
Q

free radicals of water

A

hyrdolysis

18
Q

why are children more sensitive to radiation?

A

rapid cell mitosis

19
Q

GO OVER EVERYTHING AGAIN IN CHAPTER

A

seriously, do it

20
Q

MPD occupational old units

A

5 rem/yr

21
Q

MPD non occupational old units

A

.05 rem/yr

22
Q

MPD occupational new units

A

.05 sv/yr (50msv)

23
Q

MPD non occupational new units

A

.005 sv/yr (5msv)

24
Q

beam size at the pts face can be no larger than ____ inches

A

2.75

25
Q

must have at least ____ of total aluminum filtration for up to and including 70kVp, if above 70 kVp it requires ____

A

1.5 mm, 2.5 mm

26
Q

more or less radiation with long cone?

A

less

27
Q

operator should stand at least ____ from the scatter course measures from pts head

A

6 feet

Dental Hygiene Board Review (12 decks)

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